Home > Products > SIEMENS > SIMATIC S7 Series
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INPUTS
2 digital inputs
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RATED VOLTAGE
24 V DC
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INPUT STANDARD
IEC 61131 Type 1
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MODULE SIZE
10 × 64 × 51 mm
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LEAD TIME
In stock
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WARRANTY
1 year
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Discrete signal acquisition
Provides two 24 V DC digital input channels for detecting binary field states in a SIMATIC SC installation.
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Two-wire sensor connection
The official data sheet permits connectable two-wire sensors with a maximum permissible quiescent current of 1.5 mA.
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Long field wiring
Specified cable lengths reach 1000 m with shielded cable and 600 m with unshielded cable.
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Legacy system maintenance
Supports model-specific repair and replacement work in installed ET 200L-SC / SIMATIC SC systems.
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Complete model
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6ES7121-1BB00-0AA0
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Brand
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Siemens
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Product family
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SIMATIC SC / ET 200L-SC
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Product type
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Electronic submodule with digital inputs
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Digital inputs
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2
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Rated supply and input voltage
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24 V DC
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Input characteristic
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IEC 61131, Type 1
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Signal 0 voltage
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-3 to +5 V DC
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Signal 1 voltage
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13 to 30 V DC
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Input current at signal 1
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Typically 7 mA
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Input delay, 0 to 1
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1.2 to 4.8 ms
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Input delay, 1 to 0
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1.2 ms to 4.8 µs, as stated in the official data sheet
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Required terminal block
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TB16SC
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Required slots
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1 of 8
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Power loss
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Typically 0.4 W
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Shielded cable length
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Up to 1000 m
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Unshielded cable length
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Up to 600 m
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Isolation test voltage
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1500 V AC
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Diagnostics and alarms
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Not provided
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Dimensions
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10 × 64 × 51 mm (W × H × D)
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Weight
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Approximately 15 g
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Lifecycle
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Spare part; product deleted without replacement
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Discrete signal acquisition
Provides two 24 V DC digital input channels for detecting binary field states in a SIMATIC SC installation.
|
|
Two-wire sensor connection
The official data sheet permits connectable two-wire sensors with a maximum permissible quiescent current of 1.5 mA.
|
|
Long field wiring
Specified cable lengths reach 1000 m with shielded cable and 600 m with unshielded cable.
|
|
Legacy system maintenance
Supports model-specific repair and replacement work in installed ET 200L-SC / SIMATIC SC systems.
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Module format
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Single-width electronic submodule
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Terminal interface
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Requires TB16SC terminal block
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Input channels
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2 non-isolated digital inputs
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Backplane relationship
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No channel-to-backplane potential separation; optocoupler stated
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Status indication
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Green status indicator for each digital input
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Package statement
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8 pieces per packaging unit
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1 · Confirm the base
Verify that the installed station uses the TB16SC terminal block and has one free single-width slot.
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2 · Check field voltage
Confirm 24 V DC signals and the official signal 0 and signal 1 voltage ranges before wiring.
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3 · Match sensors
For two-wire sensors, verify that the permissible quiescent current does not exceed 1.5 mA.
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4 · Observe cable limits
Use the stated maximum lengths for shielded and unshielded input wiring.
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5 · Test the channel
After installation, verify the green input-status indication and the PLC input image for both channels.
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Required base
The electronic submodule requires the Siemens TB16SC terminal block.
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Slot demand
One single-width slot is required in the eight-slot hardware arrangement.
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Electrical fit
Field devices must match the 24 V DC Type 1 input characteristic and signal thresholds.
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Lifecycle check
The model is discontinued without a Siemens replacement; legacy-system identification is essential.
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Q1 · How is the exact quoted module verified?
Match 6ES7121-1BB00-0AA0 on the label and quotation, and confirm that the description states two 24 V DC digital inputs rather than a digital-output or analog submodule.
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Q2 · How can New, Used or Refurbished condition be distinguished?
Request current close-up photos of the label, connector edge, housing and status-LED area. Look for insertion marks, repaired plastic, oxidation or removed identification.
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Q3 · How should the supplier be qualified?
Verify the legal company identity, payment beneficiary, traceable offer and ability to provide the official Siemens two-page data sheet for the exact discontinued part.
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Q4 · What must engineering check before ordering?
Confirm the TB16SC base, one available slot, 24 V DC Type 1 signals, two required inputs, sensor quiescent current and permitted cable length.
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Q5 · What evidence should be obtained before payment?
Ask for dated photos showing the complete part number, packaging quantity, connector edge and both input-channel indicators, linked to the same quotation.
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Q6 · Can another SIMATIC SC submodule replace it?
Not automatically. Input/output function, channel count, voltage characteristic, terminal-block requirement and slot format must all match the original design.
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